Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/32045 |
Resumo: | Galactomannan extracted from seeds of Cassia grandis with 0.1 M NaCl, followed by ethanol precipitation, presented a yield of 36 ± 8%. The polysaccharide has a constant mannose/galactose ratio (2.44:1). Methylation analysis, one and two dimensional NMR spectroscopy confirmed that the polysaccharide has a central core composed of 4-linked β-mannose units, with branches of galactose, linked to the carbohydrate core through α(1–6) linkage. The amorphous nature of the galactomannan was confirmed by X-ray diffraction. Rheological characterization exhibited Newtonian plateaus followed by shear-thinning zones characteristic of polymer solutions up to 1.5% (w/v) and above this value the system exhibited yield stress associated with a weak gel. Adjusting stress-strain curves confirmed a 1.6% (w/v) as the galactomannan concentration value for the sol–gel transition. These results indicate that the galactomannan extracted from C. grandis seeds presents rheological characteristics suitable for applications in pharmaceutical, biomedical, cosmetic and food industries. |
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Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandisGalactomannanCassia grandisRheologyX-rayNMRCharacterizationScience & TechnologyGalactomannan extracted from seeds of Cassia grandis with 0.1 M NaCl, followed by ethanol precipitation, presented a yield of 36 ± 8%. The polysaccharide has a constant mannose/galactose ratio (2.44:1). Methylation analysis, one and two dimensional NMR spectroscopy confirmed that the polysaccharide has a central core composed of 4-linked β-mannose units, with branches of galactose, linked to the carbohydrate core through α(1–6) linkage. The amorphous nature of the galactomannan was confirmed by X-ray diffraction. Rheological characterization exhibited Newtonian plateaus followed by shear-thinning zones characteristic of polymer solutions up to 1.5% (w/v) and above this value the system exhibited yield stress associated with a weak gel. Adjusting stress-strain curves confirmed a 1.6% (w/v) as the galactomannan concentration value for the sol–gel transition. These results indicate that the galactomannan extracted from C. grandis seeds presents rheological characteristics suitable for applications in pharmaceutical, biomedical, cosmetic and food industries.The authors Priscilla B.S. Albuquerque and Gustavo R.C. Santos are recipient of a scholarship from Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq). The authors express their gratitude to the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) for research grants and fellowship (MTSC, PASM and MGCC). The authors acknowledge Centro de Tecnologias Estrategicas do Nordeste (CETENE) for analytical support and CNPq and Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) for financial support.ElsevierUniversidade do MinhoAlbuquerque, Priscilla B. S.Barros Junior, WilsonSantos, Gustavo R. C.Correia, Maria T. S.Mourão, Paulo A. S.Teixeira, J. A.Carneiro-da-Cunha, Maria G.20142014-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/32045engAlbuquerque, Priscilla B. S.; Barros Jr. , Wilson; Santos, Gustavo R. C.; Correia, Maria T. S.; Mourão, Paulo A. S.; Teixeira, José A.; Carneiro-da-Cunha, M. G., Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis. Carbohydrate Polymers, 104, 127-134, 20140144-86170144-861710.1016/j.carbpol.2014.01.01024607169http://www.journals.elsevier.com/carbohydrate-polymers/info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:25:20Zoai:repositorium.sdum.uminho.pt:1822/32045Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:19:33.305389Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis |
title |
Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis |
spellingShingle |
Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis Albuquerque, Priscilla B. S. Galactomannan Cassia grandis Rheology X-ray NMR Characterization Science & Technology |
title_short |
Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis |
title_full |
Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis |
title_fullStr |
Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis |
title_full_unstemmed |
Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis |
title_sort |
Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis |
author |
Albuquerque, Priscilla B. S. |
author_facet |
Albuquerque, Priscilla B. S. Barros Junior, Wilson Santos, Gustavo R. C. Correia, Maria T. S. Mourão, Paulo A. S. Teixeira, J. A. Carneiro-da-Cunha, Maria G. |
author_role |
author |
author2 |
Barros Junior, Wilson Santos, Gustavo R. C. Correia, Maria T. S. Mourão, Paulo A. S. Teixeira, J. A. Carneiro-da-Cunha, Maria G. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Albuquerque, Priscilla B. S. Barros Junior, Wilson Santos, Gustavo R. C. Correia, Maria T. S. Mourão, Paulo A. S. Teixeira, J. A. Carneiro-da-Cunha, Maria G. |
dc.subject.por.fl_str_mv |
Galactomannan Cassia grandis Rheology X-ray NMR Characterization Science & Technology |
topic |
Galactomannan Cassia grandis Rheology X-ray NMR Characterization Science & Technology |
description |
Galactomannan extracted from seeds of Cassia grandis with 0.1 M NaCl, followed by ethanol precipitation, presented a yield of 36 ± 8%. The polysaccharide has a constant mannose/galactose ratio (2.44:1). Methylation analysis, one and two dimensional NMR spectroscopy confirmed that the polysaccharide has a central core composed of 4-linked β-mannose units, with branches of galactose, linked to the carbohydrate core through α(1–6) linkage. The amorphous nature of the galactomannan was confirmed by X-ray diffraction. Rheological characterization exhibited Newtonian plateaus followed by shear-thinning zones characteristic of polymer solutions up to 1.5% (w/v) and above this value the system exhibited yield stress associated with a weak gel. Adjusting stress-strain curves confirmed a 1.6% (w/v) as the galactomannan concentration value for the sol–gel transition. These results indicate that the galactomannan extracted from C. grandis seeds presents rheological characteristics suitable for applications in pharmaceutical, biomedical, cosmetic and food industries. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014 2014-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/32045 |
url |
http://hdl.handle.net/1822/32045 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Albuquerque, Priscilla B. S.; Barros Jr. , Wilson; Santos, Gustavo R. C.; Correia, Maria T. S.; Mourão, Paulo A. S.; Teixeira, José A.; Carneiro-da-Cunha, M. G., Characterization and rheological study of the galactomannan extracted from seeds of Cassia grandis. Carbohydrate Polymers, 104, 127-134, 2014 0144-8617 0144-8617 10.1016/j.carbpol.2014.01.010 24607169 http://www.journals.elsevier.com/carbohydrate-polymers/ |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799132654920007680 |